Implement support for unprefixed keyframes rules resolution.

Source/core/css/resolver/ScopedStyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 317 matching lines @@
     KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(animationName);
     if (it == m_keyframesRuleMap.end())
         return 0;
 
     return it->value.get();
 }
 
 void ScopedStyleResolver::addKeyframeStyle(PassRefPtr<StyleRuleKeyframes> rule)
 {
     AtomicString s(rule->name());
-    m_keyframesRuleMap.set(s.impl(), rule);
+    if (rule->isVendorPrefixed()) {
+        KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(rule->name().impl());
+        if (it == m_keyframesRuleMap.end())
+            m_keyframesRuleMap.set(s.impl(), rule);
+        else if (it->value->isVendorPrefixed())
+            m_keyframesRuleMap.set(s.impl(), rule);
+    } else {
+        m_keyframesRuleMap.set(s.impl(), rule);
+    }
 }
 
 inline RuleSet* ScopedStyleResolver::atHostRuleSetFor(const ShadowRoot* shadowRoot) const
 {
     HashMap<const ShadowRoot*, OwnPtr<RuleSet> >::const_iterator it = m_atHostRules.find(shadowRoot);
     return it != m_atHostRules.end() ? it->value.get() : 0;
 }
 
 void ScopedStyleResolver::matchHostRules(ElementRuleCollector& collector, bool includeEmptyRules)
 {
@@ skipping 70 matching lines @@
     collector.matchPageRules(m_authorStyle.get());
 }
 
 void ScopedStyleResolver::collectViewportRulesTo(StyleResolver* resolver) const
 {
     if (m_authorStyle)
         resolver->collectViewportRules(m_authorStyle.get());
 }
 
 } // namespace WebCore